Merge 88139

Source/WebCore/rendering/svg/SVGTextRunRenderingContext.cpp

 /*
  * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 96 matching lines @@
         : m_fontData(fontData)
         , m_fontElement(fontElement)
         , m_walkerData(data)
         , m_walkerCallback(callback)
         , m_walkerMissingGlyphCallback(missingGlyphCallback)
     {
     }
 
     void walk(const TextRun& run, bool isVerticalText, const String& language, int from, int to)
     {
-        ASSERT(0 <= from && from <= to && to - from <= run.length());
+        if (from < 0 || to < 0 || from > to || from >= run.length() || to > run.length())
+            return;         
 
         const String text = Font::normalizeSpaces(run.data(from), to - from);
         Vector<SVGGlyph::ArabicForm> chars(charactersWithArabicForm(text, run.rtl()));
 
         SVGGlyph identifier;
         bool foundGlyph = false;
         int characterLookupRange;
         int endOfScanRange = to + m_walkerData.extraCharsAvailable;
 
         RenderObject* renderObject = referencingRenderObjectFromRun(run);
@@ skipping 307 matching lines @@
 {
     // TODO: Fix text selection when HTML text is drawn using a SVG Font
     // We need to integrate the SVG text selection code in the offsetForPosition() framework.
     // This will also fix a major issue, that SVG Text code can't select arabic strings properly.
     return 0;
 }
 
 }
 
 #endif